drm/xe: Only check last fence on user binds

We only set the last fence on user binds, so no need to check last fence
kernel issued binds. Will avoid blowing up last fence lockdep asserts.

Cc: Francois Dugast <francois.dugast@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240805200233.3050325-1-matthew.brost@intel.com